#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>



int main(int argc,char*argv[])
{
    if(argc <=2)
    {
        printf("usage: %s ip_address port_number \n",
        basename(argv[0]));
        return 1;
    }

    const char* ip = argv[1];
    int port = atoi(argv[2]);

    int sock = socket(PF_INET,SOCK_STREAM,0);
    assert(sock >=0);


    /*创建一个IPv4 socket地址*/
    struct sockaddr_in address;
    bzero(&address,sizeof(address));
    address.sin_family = AF_INET;
    inet_pton(AF_INET,ip,&address.sin_addr);
    address.sin_port= htons(port);

    int ret = bind(sock,(struct sockaddr*)&address,sizeof(address));
    assert(ret != -1);


    ret = listen(sock,5);
    assert(ret != -1);

    //暂停20秒以等待客户端连接和相关操作（掉线线或者退出）完成
    sleep(60);
    struct sockaddr_in client;
    socklen_t client_addrlength = sizeof(client);
    int connfd = accept(sock,(struct sockaddr*)&client,&client_addrlength);
    if(connfd < 0)
    {
        printf("error is:%d\n",errno);
    }
    else{

        /*接受连接成功面则打印客户端IP地址和商品号*/
        char remote[INET_ADDRSTRLEN];
        printf("connected with ip:%s and port:%d\n",inet_ntop(AF_INET,
        &client.sin_addr,remote,INET_ADDRSTRLEN),ntohs(client.sin_port));
        close(connfd);
    }
    /*关闭socket,见后文*/
    close(sock);
    return 0;
}

